Find a polynomial of least degree with only real coefficients and having the given zeros.2 + i, 4
A. f(x) = x3 + 9x2 + 20x + 20
B. f(x) = x3 - 4x2 - (3 - 4i) x + 12 + 16i
C. f(x) = x3 + 8x2 + 21x + 20
D. f(x) = x3 - 8x2 + 21x - 20
Answer: D
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